Study of graphite intercalated by fluor for neutron reflection
The development of efficient neutron reflectors is important both for production of neutrons of different wavelengths as well as for their efficient use. Thus, we develop nano-diamond (ND) reflectors, which are particularly useful for the diffusive reflection of very cold neutrons and the quasi-specular reflection of cold neutrons. However, there is still a reflectivity gap in terms of neutron velocity (wavelength) corresponding to ND reflectors and standard reflectors of thermal and a harder fraction of cold neutrons. In order to bridge this gap we proposed a new type of reflector and developed it in the framework of NERF ANR project in the collaboration between Clermomt-Ferrand University and ILL. There are powders of graphite intercalated by flour. In analogy to the efficient F-ND reflectors, it contains only nuclei with small absorption cross section. The specific feature of this material is its huge interplanar distances. We plan to perform its detailed reflecting properties as a function of wavelength, outcoming angle, transport in the powder etc. There is no standard ILL instrument which allows this study. We have done a test at PF1B and showed that it is feasible here.
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NESVIZHEVSKY Valery; Marc DUBOIS; GAUDISSON Thomas; HENRY Killian; LE FLOCH Sylvie; PISCHEDDA Vittoria; PUSHIN Dmitry and Zhernenkov. (2021). Study of graphite intercalated by fluor for neutron reflection. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-07-403
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